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Device and method used for water electrolysis hydrogen production and CO2 methanation production of synthetic natural gas

A technology for synthesizing natural gas and electrolyzing water, applied in the direction of electrolysis process, electrolysis components, gas fuel, etc., can solve the problems of low energy conversion efficiency, complex process flow, limited application, etc., and achieve the goal of reducing preparation cost, pollution and energy The effect of loss

Pending Publication Date: 2019-10-22
SICHUAN ENERGY INTERNET RES INST TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overall, due to the low energy conversion efficiency and high cost, the CO 2 Application of Methanation Synthetic Natural Gas Technology
[0003] Existing patents such as the Chinese patent [CN201210380047.6] disclose a method and device for producing synthetic natural gas. The raw material gas is divided into four streams and then undergoes a four-stage methanation reaction, and an independent steam system is provided at the same time. The process is complicated and the cost is high.

Method used

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  • Device and method used for water electrolysis hydrogen production and CO2 methanation production of synthetic natural gas
  • Device and method used for water electrolysis hydrogen production and CO2 methanation production of synthetic natural gas
  • Device and method used for water electrolysis hydrogen production and CO2 methanation production of synthetic natural gas

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Embodiment 1

[0029] Such as Figure 1-3 As shown, a device for producing hydrogen by electrolysis of water and methanation of CO2 to produce synthetic natural gas includes a hydrogen production unit 3 by electrolysis of water, a carbon dioxide generation unit 5 and a methanation unit 6 .

[0030] The water outlet of the water tank 1 is connected to the electrolytic water hydrogen production unit 3 through the pipeline through the heat exchanger 2, the electrolytic water hydrogen production unit 3 and the carbon dioxide generation unit 5 are respectively connected to the gas mixer 4, and the mixed gas outlet of the gas mixer 4 is through a pipeline It is connected with the methanation unit 6, and the methanation unit 6 is connected with the heat exchanger 2 and the gas-liquid separation reactor 7 in sequence, and the liquid outlet of the gas-liquid separation reactor 7 is connected with the water tank through a pipeline.

[0031] The electrolytic water hydrogen production unit 3 includes an...

Embodiment 2

[0042] The device of this embodiment is as figure 1 shown.

[0043] The preparation steps are as follows:

[0044] A. After the water is pretreated by the water tank 1, it is treated by the heat exchanger 2 to become superheated steam and enters the electrolytic water hydrogen production device 31 in the electrolytic water hydrogen production unit 3, and the hydrogen produced enters the hydrogen purification device 32 and is purified. Enter gas mixer 4.

[0045] CO in the carbon source device 51 in B, carbon dioxide generating unit 5 2 After entering the carbon dioxide purification unit 52 for purification, enter the gas mixer 4, CO 2 The gas volume ratio with hydrogen is 1:4-6, fully mixed with hydrogen and heated to 250-450°C, the mixed gas enters the catalytic reaction kit 61 in the methanation unit 6, and obtains 275-375°C high-temperature methane gas and high-temperature water vapor.

[0046] C. High-temperature methane gas and high-temperature water vapor enter the ...

Embodiment 3

[0051] The device of this embodiment is as figure 2 shown.

[0052] The preparation steps are as follows:

[0053] A. After the water is pretreated by the water tank 1, it is treated by the heat exchanger 2 to become superheated steam and enters the electrolytic water hydrogen production device 31 in the electrolytic water hydrogen production unit 3, and is further processed by the steam treatment device 311 and mixed with a small amount of hydrogen. The gas after the steam treatment device enters the electrolysis water hydrogen production equipment 312 for the electrolysis water hydrogen production reaction, the hydrogen produced by the reaction enters the hydrogen gas collection device 313, the oxygen produced by the reaction enters the oxygen collection device 314, and the waste gas generated by the reaction enters the waste gas collection device 315. The hydrogen in the hydrogen collecting device 313 enters the hydrogen purifying device 32 for purification and then enter...

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Abstract

The invention belongs to the technical field of synthetic natural gas, and relates to a device and a method used for water electrolysis hydrogen production and CO2 methanation production of syntheticnatural gas. The device comprises a water tank, a heat exchanger, a gas mixer, and a gas liquid separation reactor, and also comprises a water electrolysis hydrogen production unit, a carbon dioxide generation unit, and a methanation unit. According to the method, heat exchange is adopted for recycling of heat energy released in methanation process by the water electrolysis hydrogen production unit, so that energy loss in water electrolysis hydrogen production process is reduced, water generated in reaction process is recycled at the same time, the preparation cost of CO2 methanation production of synthetic natural gas is reduced, and no pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of synthetic natural gas, and relates to a method for electrolyzing water to produce hydrogen and CO 2 A device and method for producing synthetic natural gas by methanation. Background technique [0002] With the increasing problem of global carbon dioxide emissions, the development of CO 2 Technology as a potential carbon resource has been increasingly valued, among which, the use of CO 2 Methanation of synthetic natural gas (Synthetic Natural Gas, SNG) technology is currently an important research field. CO 2 Methanation is the use of H 2 and CO 2 / CO reaction to produce methane technology, however, CO 2 Methanation is a strongly exothermic reaction, H 2 Participate in CO 2 During / CO methanation, at least about 64% of energy is lost. How to utilize the waste heat generated by the methanation reaction and how to ensure a relatively stable reaction of the methanation reaction are important issues ...

Claims

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Application Information

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IPC IPC(8): C10L3/08C10L3/10C25B1/04C25B9/00
CPCC10L3/08C10L3/106C25B1/04C25B9/00Y02E60/36
Inventor 胡强林今曾庆孙小毛龚靖博
Owner SICHUAN ENERGY INTERNET RES INST TSINGHUA UNIV
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